Cisco ONS 15600 Reference Manual page 109

Circuits and Tunnels
The terms "Unidirectional Path Switched Ring" and "UPSR" may appear in Cisco literature. These terms
Note
do not refer to using Cisco ONS 15xxx products in a unidirectional path switched ring configuration.
Rather, these terms, as well as "Path Protected Mesh Network" and "PPMN," refer generally to Cisco's
path protection feature, which may be used in any topological network configuration. Cisco does not
recommend using its path protection feature in any particular topological network configuration.
This chapter explains Cisco ONS 15600 synchronous transport signal (STS) circuits and data
communications channel (DCC) and IP-encapsulated tunnels. To provision circuits and tunnels, refer to
the Cisco ONS 15600 Procedure Guide.
Chapter topics include:
7.1 Overview, page 7-2
•
7.2 Circuit Properties, page 7-2
•
7.3 Cross-Connect Card Bandwidth, page 7-11
•
7.4 DCC Tunnels, page 7-11
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7.5 Multiple Destinations for Unidirectional Circuits, page 7-12
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7.6 Path Protection Circuits, page 7-12
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7.7 Protection Channel Access Circuits, page 7-14
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7.8 Path Trace, page 7-15
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• 7.9 Automatic Circuit Routing, page 7-15
7.10 Manual Circuit Routing, page 7-17
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7.11 Constraint-Based Circuit Routing, page 7-18
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7.12 Bridge and Roll, page 7-18
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• 7.13 Merge Circuits, page 7-23
7.14 Reconfigure Circuits, page 7-24
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In this chapter, "cross-connect" and "circuit" have the following meanings: cross-connect refers to the
Note
connections that occur within a single ONS 15600 to allow a circuit to enter and exit an ONS 15600.
Circuit refers to the series of connections from a traffic source (where traffic enters the ONS 15600
network) to the destination (where traffic exits an ONS 15600 network).
C H A P T E R
Cisco ONS 15600 Reference Manual, R6.0
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7-1